/*********************************************************************
 * Copyright (C) 2002 Andrew Khan
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * <p>
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ***************************************************************************/

package jxl.write.biff;

import jxl.biff.IntegerHelper;
import jxl.biff.Type;
import jxl.biff.WritableRecordData;
import jxl.write.Number;

import java.util.List;

/**
 * Contains an array of RK numbers
 */
class MulRKRecord extends WritableRecordData {
    /**
     * The row  containing these numbers
     */
    private int row;
    /**
     * The first column these rk number occur on
     */
    private int colFirst;
    /**
     * The last column these rk number occur on
     */
    private int colLast;
    /**
     * The array of rk numbers
     */
    private int[] rknumbers;
    /**
     * The array of xf indices
     */
    private int[] xfIndices;

    /**
     * Constructs the rk numbers from the integer cells
     *
     * @param numbers A list of jxl.write.Number objects
     */
    public MulRKRecord(List numbers) {
        super(Type.MULRK);
        row = ((Number) numbers.get(0)).getRow();
        colFirst = ((Number) numbers.get(0)).getColumn();
        colLast = colFirst + numbers.size() - 1;

        rknumbers = new int[numbers.size()];
        xfIndices = new int[numbers.size()];

        for (int i = 0; i < numbers.size(); i++) {
            rknumbers[i] = (int) ((Number) numbers.get(i)).getValue();
            xfIndices[i] = ((CellValue) numbers.get(i)).getXFIndex();
        }
    }

    /**
     * Gets the binary data for output to file
     *
     * @return the binary data
     */
    public byte[] getData() {
        byte[] data = new byte[rknumbers.length * 6 + 6];

        // Set up the row and the first column
        IntegerHelper.getTwoBytes(row, data, 0);
        IntegerHelper.getTwoBytes(colFirst, data, 2);

        // Add all the rk numbers
        int pos = 4;
        int rkValue = 0;
        byte[] rkBytes = new byte[4];
        for (int i = 0; i < rknumbers.length; i++) {
            IntegerHelper.getTwoBytes(xfIndices[i], data, pos);

            // To represent an int as an Excel RK value, we have to
            // undergo some outrageous jiggery pokery, as follows:

            // Gets the  bit representation of the number
            rkValue = rknumbers[i] << 2;

            // Set the integer bit
            rkValue |= 0x2;
            IntegerHelper.getFourBytes(rkValue, data, pos + 2);

            pos += 6;
        }

        // Write the number of rk numbers in this record
        IntegerHelper.getTwoBytes(colLast, data, pos);

        return data;
    }
}




